Gas burner



Oct. 23, 1934. H. HL SWEET GAS URNER Filed 0G12. 21. 1951 Patented Oct.` 23, 1934 uNirEo s'rA'rissA PATENT OFFICE- GAS BURNER l Henry H. Sweet, Atlanta, Gra.` Application October 21, 1931, Serial No. 570,235 p 3 claims. (cl. 158-111) This invention relates generally to gas burners, and, or more particularly to attachments for gas burners of the Bunsen type, for generating, especially from natural gas, such high temperatures as n 5. are necessary and desirable in laboratories, jewelers and dental offices and the like, and also such other industrial or domestic uses to which the burner might be adaptable.

The main object of the invention is to pro- 10 vide a burner construction in which the `several elements areadjustable relative to each other, and are designed so that they can be manufactured very cheaply, and readily assembled for use.

A further object of the invention is to provide an attachment for burners of this type in which an intense heating flame is obtained when the gas issues from the burner at high speed and in which the attachment prevents the flame from 120 blowing away from the burner and becoming extinguished.

One sheet of drawings accompanies this speciiication as` part thereof, in which like reference characters indicate like parts throughout:

Figure l isa side elevation, partly in section of the improved burner; l

Figure 2 is a plan'view of the assembled burner;

Figure 3 is a perspective view of the`bracket member; y 30, Figure 4 is a plan view of a thimble which is adjustably mounted on the base of the burner and serves as a lock nut in addition to its function of providing an orifice for the emissionof the gas; land Figure 5 is a vertical transverse section. taken on the line 5-5 of Figure 4.

Referring to the drawing, the .reference numeral l designates a base having a chamber 2 formed therein and communicating with a gas j supply pipe 3. The chamber 2 may be formed by boring a cylindrical recess into the base; and the depth of the chamber may be regulated by a screwthreaded plug 4 threaded into the said recess. The upper end of the chamber 2 is formed `by a wall 5 centrally apertured to permit the emission of gas from the chamber 2; and the aperture in the wall 5 is screwthreaded to receive the externally screwthreaded nipple 6.

A U-shaped bracket 6 has internally screwjthreaded apertures 8 and 8 formed in the parallel legs '7 and 7 respectively. Either of these apertures is adapted to engage the external screwthreads of the nipple 6 in order that the bracket 6 may be clamped on the top of the wall 5 of the .55'base member 1. Thimble9 of the same internal diameter as the external diameter of `the nipple 6 is internally screwthreaded for adjustment on the nipple 6, and this thimble. 9 is providedwith a central orifice 10 through which the gas emerges from the chamber 2. e

Particular attention is directed to the fact that the thimble 9 not only provides the emission orice for the gas but also serves as ya lock nut for securing the bracket 7 in any desired position of adjustment on the nipple 6. Preferably this thimble 9 not only locks the bracket '7 to the nipple 6 ybut also locks .the nipple 6 to the base member 1 when the bracket "7 is in the position shown in Figure 1 of the ldrawing. 1n` other words, the thimble 9 hasa two fold function: It serves as a means for providing the emission orifice for the gas and also serves as a lock nut for clamping the bracket 7 `and lnipple 6 in position on the base member. i

The upper aperture 8 has a second nipple 1l screwthreaded thereintojin order to provide for any desired adjustment of the nipple l1 relative to the oriice 10 at the upper part of the thimble 9. `Slt is to4 benoted that the nipples-6 and 11 andthe `orice 10 are coaxial so as to provide a straight line ow for the gas emerging from the base member. i I 1 The mostimportant part of this invention is a blast chamber adjustably mounted by means of the nut 12 on the upper nipple 11. This nut 12 has two or more rods extending upwardly and outwardly therefrom and forming a spider to be connected to the lower end of the lblast chamber 14. `This blast lchamber 14 is shaped as a truncated cone having its narrow end remote from the burner itself, and is yprovided at its upper end with an inwardly directed flange l5. It is immaterial just what shape the outer surface of the blast chamber 14 assumes. It is however, essential that the inner surface thereof be formed as a truncated cone having its axis coaxial with the axes of the nipples 6 and 11. As is well known to users of the ordinary types of gas burners utilizing natural gas, the flame issues from the tip corresponding to the nipple 1l and will continue to burn there so long as the pressure and volume of gas is comparatively low. With increase of pressure and volume, however, the flame blows away and the 'burner becomes extinguished notwithstanding the fact that the gas still issues therefrom at high speed.

The lblast chamber is designed to prevent eX- tinction of the flame and to secure an increase in temperature. This chamber has a flange at the top thereof forming a trap for the gas emergiii) ing from the nipple 11. The comparatively wide top and wider base of the chamber provide a means whereby suflicient air may be drawn into the blast chamber to eiect complete combustion of the elements of the gas entrapped in the chamber 14.

When the gas flowing through the nipple 11 is Iignited at the upper end of the nipple 1l, the gas continues to burn as in 'any other Bunsen burner. If the volume and pressure is increased, however, the flame detaches itself from the top of the nipple 11 and travels up into the `blast charnber 14 where it continues to burn with a blast llike noise and develops very high temperature.

It thus .appears that up to and including the ni-pple 11, the invention is somewhat similar to 'the ordinary Bunsen burner, and operates in the same manner. The addition of the Iblast chamber 14 enables these ordinary burners to be used for the purpose of obtaining temperatures which can not possibly be obtained by the use of the burner itself. This is particularly true when the fuel is natural gas, although it operates quite eiiciently with any other gas adapted for use in this type of burner.

It may be well to state here that a blast chamber of cylindrical type is useless because the 'llames continue to blow away, and the cylinder merely forms a somewhat large extension of the nipple 11. The truncated form is essential, because this form retards the flow of gas away from the burner suiiiciently to insure its combustion. The flange 15 is also beneficial because it serves still further to retard the ilow of gas through the blast chamber by reducing the opening at its top and thereby entrapping the name. In use, the blast chamber will be adjusted toward and from the nipple 11 to secure the most efficient results. The nipple 11 may also be adjusted toward and' away from the orifice 10 at the top of the thim ble 9 for the same purpose.

Varying with the different sizes of Athe apparatus, there is a critical distance between the upper end of the nipple l1 and the lower Awide end of the blast chamber. In otherwords, for proper operation of the device, there isa certain minimum distance which must intervene between the upper end of nipple 11 and the wide end of the blast chamber. Beyond this critical distance, a small adjustability takes care of small variations in gas pressure.

While I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the patent statutes, it should be understood that I do not limit my invention thereto, since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the

Y scope of which is set forth in the annexed claims.

What I claim is: 1. The combination with a gas burner comprising a base having a gas nipple extending upwardly therefrom, a bracket adjustably secured to said nipple, a second nipple adjustably secured to said bracket and in axial alignment with the first named nipple, an open ended blast chamber formed as a truncated cone, and means for adjustably supporting said blast chamber on the second nipple.

2. The combination with a gas burner comprising a base having a gas nipple extending upwardly therefrom, a bracket adjustably secured to said nipple, a second nipple adjustably secured to said bracket and in axial alignment with the first named nipple, an open ended blast chamber formed as a truncated cone, means for adjustably supporting said blast chamber on the second nipple, and a lange extending inwardly from the upper open end of said cone.

3. A gas burner comprising a base provided with a gas chamber, a nipple screwthreaded into said base and in communication with said chamber, a U-shaped bracket secured to said nipple, a thimble provided with a central orice and screwthreaded into said nipple to form a means for locking the bracket to the nipple, a second nipple adjustably secured to said bracket in axial alignment with the first named nipple and a blast chamber adjustably secured to the second nipple, said chamber being formed as a truncated cone having the wide end thereof positioned toward said second nipple, and a gas retarding flange extending inwardly from the upper open end of said blast chamber.

HENRY H. SWEET. 

